SR-IOV charm configures only OVN SR-IOV mechanism driver which requires capability=switchdev and /sys/class/net/<iface>/phys_switch_id to be readable. Intel X710 driver does not provide readable phys_switch_id.
This driver requires switchdev mode for port types direct (SR-IOV VF PT) and direct-physical (PF PT):
/usr/lib/python3/dist-packages/neutron/common/ovn/constants.py:
EXTERNAL_PORT_TYPES = (portbindings.VNIC_DIRECT,
portbindings.VNIC_DIRECT_PHYSICAL,
portbindings.VNIC_MACVTAP)
/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/mech_driver.py:761
if (vnic_type in ovn_const.EXTERNAL_PORT_TYPES and
ovn_const.PORT_CAP_SWITCHDEV not in capabilities):
LOG.debug("Refusing to bind port due to unsupported vnic_type: %s "
"with no switchdev capability", vnic_type)
return
However x710 driver in 4.15 and 5.4.0-52 kernel with X710 driver 2.1.14-k and 2.8.20-k (HWE) does not support this mode. Switchdev mode requires:
pf_path = "/sys/class/net/%s" % pf_ifname
pf_sw_id_file = os.path.join(pf_path, "phys_switch_id")
However this operation is not supported in the above mentioned configs:
cat: /sys/class/net/ens3f0/phys_switch_id: Operation not supported
cat: /sys/class/net/ens3f1/phys_switch_id: Operation not supported
The legacy SR-IOV mode is the only supported supported in sriovnicswitch:
/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/mech_sriov/mech_driver/mech_driver.py
if (vnic_type == portbindings.VNIC_DIRECT and
'switchdev' in capabilities):
LOG.debug("Refusing to bind due to unsupported vnic_type: %s "
"with switchdev capability", portbindings.VNIC_DIRECT)
return
Unfortunately the charm does not start start Neutron SR-IOV Agent, using only OVN mechanism driver hence not allowing to use SR-IOV.
Switchdev mode is used for hardware offload.
Regular SR-IOV is also supported by the charm by enabling a configuration option and adding an optional relation.
Please refer to the documentation [0] for more information.
0: https:/